Negative-index dispersion and accidental mode degeneracy in an asymmetric spoof–insulator

Negative-index dispersion and accidental mode degeneracy in an asymmetric spoof–insulator–spoof waveguide

Tian Li-li¹, Liu Jian-long¹, Zhou Ke-ya¹, Gao Yang², Liu Shu-tian^{1, †}

(color online) (a) Three-dimensional diagram of the excitation structure. (b) Front view of the excitation structure. (c) The simulated S₂₁ of the excitation structure. (d) H_z distribution of the symmetric-like mode at 56.9 GHz at an xy plane which is 0.1d above the structure. (e) H_z distribution of the anti-symmetric-like mode at 55.5 GHz at an xy plane which is 0.1d above the structure.